摘要
在岩浆阶段 ,富集金属元素最有效的机制是流体熔体的分离。受到硅酸盐熔体中盐的溶解度的限制 ,这种分离实为一个天然结晶过程的产物 ,所以必然发生在岩浆结晶的最后阶段。含氟的花岗岩体系中的矿物相的关系是已知的 ,并已确定了一个宽的液相不混溶区 ,其中也包括霞石标准分子的成分。该体系的不同部分 ,由多种元素在共存的硅酸盐和氟化铝两种熔体间的分配就可以得知。在这些实验中首次确定出元素分配与体系成分间的关系。这些数据也可解释一些经验数据所熟知的地球化学标志的变化。
The most efficient ore components concentration mechanism at the magmatic stage must be the separation of fluid melt. The separation is a result of natural crystallization course owing to a limited salt solubility in silicate melts. So it is inevitable at the latest stages of the magma differentiation. Phase relations in the fluorine-bearing granite system are known, and a wide area of liquid immiscibility which includes also nepheline-normative compositions has been established. Partition of many elements between the resulted coexisting silicate and aluminium-fluorine melts has been come to know in different parts of the system. It was during these experiments that the dependence of the element distribution on the system composition was established for the first time. The data may also explain some changes of geochemical indicators, well known by empirical data.
出处
《地学前缘》
EI
CAS
CSCD
2001年第3期45-51,共7页
Earth Science Frontiers
基金
theRussianFoundationoffundamentalResearchandbytheprogramRussiaUniversities
